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compiler/spirv: implement 16-bit asin

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v2:
  - use nir_fmul_imm and nir_fadd_imm helpers (Jason)

v3:
 - missed one case where we need to replace nir_imm_float
   with nir_imm_floatN_t (Jason)

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Iago Toral Quiroga 2018-04-18 08:47:53 +02:00
parent 95b7c29c2c
commit dbbbe24d76
1 changed files with 14 additions and 9 deletions
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23
src/compiler/spirv/vtn_glsl450.c
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@ -202,17 +202,22 @@ build_log(nir_builder *b, nir_ssa_def *x)
static nir_ssa_def *
build_asin(nir_builder *b, nir_ssa_def *x, float p0, float p1)
{
nir_ssa_def *one = nir_imm_floatN_t(b, 1.0f, x->bit_size);
nir_ssa_def *abs_x = nir_fabs(b, x);
nir_ssa_def *p0_plus_xp1 = nir_fadd_imm(b, nir_fmul_imm(b, abs_x, p1), p0);
nir_ssa_def *expr_tail =
nir_fadd_imm(b, nir_fmul(b, abs_x,
nir_fadd_imm(b, nir_fmul(b, abs_x,
p0_plus_xp1),
M_PI_4f - 1.0f)),
M_PI_2f);
return nir_fmul(b, nir_fsign(b, x),
nir_fsub(b, nir_imm_float(b, M_PI_2f),
nir_fmul(b, nir_fsqrt(b, nir_fsub(b, nir_imm_float(b, 1.0f), abs_x)),
nir_fadd(b, nir_imm_float(b, M_PI_2f),
nir_fmul(b, abs_x,
nir_fadd(b, nir_imm_float(b, M_PI_4f - 1.0f),
nir_fmul(b, abs_x,
nir_fadd(b, nir_imm_float(b, p0),
nir_fmul(b, abs_x,
nir_imm_float(b, p1))))))))));
nir_fsub(b, nir_imm_floatN_t(b, M_PI_2f, x->bit_size),
nir_fmul(b, nir_fsqrt(b, nir_fsub(b, one, abs_x)),
expr_tail)));
}
/**